Anello catena bici strada cerchio singolo 110BCD 4 bulloni ruota aerodinamica
4 arms, Fit for 105 R7000 Ultegra R8000 Dura ace R9100 crank, single speed,can not use for double chainring. Includes: 1pcs CIRDLE chainring with bolts. Shape: CIRCLE chainring, hollow model. 38-42T can not make AERO type, It is too small.